Phone adapter for radio apparatus



gli 6, 192s,

' l E.DGNALDSN PHONE ADAPTER FOR RADIO APPARATUS Filed April 30, 1923 Z Uefa 550727 p thereto.

Patented duly 6, 192%.

wenn? il". TTlS EAMES DONALDSON, vOF BUFFALO, NEW YORK, ASSIGNOR T0 BRONZO LUBIIJA`COR- PORTION, 0F BUFFALO, NEKV YORK, A CORPORATION 0F NE?? YORK.

PHONE ADAPTER FOR RADIO APPARATUS.

f Application led april 30, 1923.

rThis invention relates to a phone adapter which is more particularly applicable to the head phones employed in connection with radio receiving apparatus.

Its chielE object is to provide an adapter ot this character Which is so constructed that it is universally applicable to the phonographs ot various makes now on the marl ket for the purpose ot amplifying the sound, so that all 'the persons in the room can hear the concerts received by the radio outfit.

Another object of 'the invention is to provide n'phone adapter which is simple and compact in construction, and which may he readily applied to and removed` from the sound tubes of phonograph horns without in any way altering their construction or Without the use of fastenings.

ln the accompanying drawings: Figure 1 is a fragmentar 1 top plan view of the sound tube of one type of phonograph showing my invention applied thereto. Figure 2 is an enlarged longitudinal section on line 2 2, Fig. l. Figure 3 is a rear face View of the adapter. Figures and 5 are sectional views, similar to Fig.. showing the adapter connected with the sound tubes of other types of phonographs. n

Similar characters et reference indicate corresponding parts in the several views.

In Figs. 1 and 2, the invention is shown in connection with a phonograph of Well known construction, wherein 10 indicates the tone arm and 11 the sound tube pivoted Removably applied to the'end of this sound tube is the phone adapter 12, the same taking the plan ot 'the customary reproducer or sound b, ct the phonograph.

This phone adapter preferably consists ot a cap 18 having an internally-threaded socket 14 on one side and a neck or projection 15 at its opposite side provided with a central opening 16 and a counter-bore 17. The counter-bore of said neck is adapted' to fit over the sound tube 11, being held thereon by friction. The threadedsocket 1/1- is adaptedto be connected With the diaphragm body or chamber 18 of a head phone, ot ordinary construction, from which the customary perforated cap has been removed. ln

serial no. 635,504.

other Words, thisphone adapter is subst`- tuted for Vthe perforated cover ofthe head phone, the latter still retaining the diaphragm 19 which is clamped between thel ada ter-cap 13 and the diaphragm chamber, as s own in Fig. 2.

ln using this phone adapter, the cover of one of the head phones of the radio outfit is disconnected and the adapter is screwed in its place, being sure that the latter is screwed on tight and that the diaphragm is properly positioned. Then the reproducer of the phonograph is removed :from the sound tube and is replaced with the phone adapter. ln the application shown in Figs. 1 and 2, the bore 17 of the cap 13 is ot' the proper size to lit over the sound tube 11 ot' certain makes of phonographs. y

In Fig. 4, the improvement is shown in connection with a sound tube 2O of another type of phonograph, the internal diameter of this tube being of a size to receive the neck 15 ot the adapter cap.

In the embodiment of the invention shown in F ig. 5, the cap 13 is provide-d with a rcmovable bushing 21 which .is fitted Within `the counter-bore 17 and Whose outer endprojects beyond the end ot' the neck 15 and may be providedwith an-open-ended slot 22.

he outer end ot this bushin' is adapted to lit Within a sound tube 23 o another malte of phonograph, the bushing-slot 22 being arranged to interlock with the pin 24 of said tube.

Freni the foregoing it will be understood that I have produced a phone adapter for radio outfits which is universally applicable to the various makes of phonographs now in use, so that the sound waves received are amplified to such a degree that everyone in the room can hear them.

The adapter is preferably made of a nickle-aluminum alloy which assures perfect tone qualities, and which, taken in connection with the scientific design of the phonograph, enables musical tones and others to be brought out clearly Without distortion or raucous/metallic sounds.

l claim as my invention:

1. As an article of manufacture. an adapter for radio head-phones and the sound tubes of phonographs, comprising a ca separate on its opposite side with a neck having a bore, both the neck and the bore constituting means for connecting the adapter with sound tubes of\di`erent sizes.

2. A phone-adapter for use in connection with phonographs having sound tubes, comprising a cap adapted for attachment to the hone, said vcap having a bore extending substantially centrally through it and constituting means for connecting said cap to a sound, tube of a given size, and a `bushing adapted to he removably/,fitted in said bore for connecting the cap with the 'sound tubes of different sizes.

v3. 'A phone-adapter for use in connection With phonographs having sound tubes, comprising a perforated cap adapted for attachment to the phone, the cap having a neck on its outer side having a bore extending through it, both the neck and its bore constituting means for connecting said cap with sound tnbes'of different sizes, :md a bashing adapted to be removably seated in said bow.l for connecting said cap with sound tubes o' asize diierent from said first-named tuberi.

EAMES DONALDSON 

